CN108079736B - Flash evaporation gas purification and recovery system - Google Patents
Flash evaporation gas purification and recovery system Download PDFInfo
- Publication number
- CN108079736B CN108079736B CN201611036218.8A CN201611036218A CN108079736B CN 108079736 B CN108079736 B CN 108079736B CN 201611036218 A CN201611036218 A CN 201611036218A CN 108079736 B CN108079736 B CN 108079736B
- Authority
- CN
- China
- Prior art keywords
- flash
- gas
- purification
- temperature
- recovery system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
Abstract
The invention relates to the technical field of flash evaporation gas recovery equipment, in particular to a flash evaporation gas purification and recovery system, which comprises a purification loop, wherein the purification loop consists of a supercharging device, a heat exchanger, a first separator and a purification device which are sequentially connected; pressurizing the flash steam collected from the flash tank by a pressurizing device to form high-pressure flash steam; high-pressure flash steam as a heating medium passes through the heat exchanger and is cooled to form low-temperature flash steam; separating a gas phase part from the low-temperature flash gas in a first separator; the gas phase part of the low-temperature flash evaporation gas passes through a purification device and forms purified flash evaporation gas; conveying the purified flash steam to a fuel gas system through a dust filter; the purification device is internally provided with a physical adsorbent. According to the flash vapor purification and recovery system provided by the invention, the skid-mounted device is adopted, the acid gas removal and the flash vapor flowing out of the outlet of the flash tank of the dehydration unit are collected and then pass through the physical adsorbent to achieve the purification effect, and the recovery system has the advantages of simple structure and flexible application.
Description
Technical Field
The invention relates to the technical field of flash evaporation gas recovery equipment, in particular to a flash evaporation gas purification and recovery system, and more particularly relates to a flash evaporation gas purification and recovery system applied to a high-sulfur-content natural gas purification system.
Background
In the existing high-sulfur natural gas purification system, the acid gas (the main component of which is H) in the feed gas is usually removed by a conventional wet method2S、CO2) And water, so that the flash gas generated in the purification process still contains impurities such as acid, water and the like, and the flash gas generated in the purification device is generally recycled and then is sent to a tail gas incinerator for co-combustion as waste gas.
The flash evaporation gas generated in the purification device has higher methane content and larger gas quantity, and the flash evaporation gas cannot be fully combusted in the tail gas incinerator, so that carbon deposition is easily blocked by a burner, the incinerator is overloaded, and even equipment is shut down. At the moment, a large amount of flash steam can only be emptied, so that the waste of effective gas is caused.
At present, no flash steam recovery device of a high-sulfur natural gas purification plant is put into operation, and generally used flash steam recovery methods are pilot run flash steam recovery methods, namely flash steam is conveyed to a feed gas system under high pressure. Because the pressure of a feed gas system is generally 3-10 MPa, the power consumption of a required compressor and the load of cooling water are large, and the requirement on equipment is high. At present, the method for reducing the load of equipment is to increase the diameters of a flash tower and a regulating valve so as to relieve the load of the equipment when the flash steam flow is overlarge, however, the method is not the basis, and still cannot solve the problems of overlarge load of an incinerator and resource waste.
The method is suitable for a liquefied natural gas process, and has the defects that refrigeration media, matched liquefying devices and low-temperature equipment need to be introduced in a high-sulfur natural gas purification process and the like.
Disclosure of Invention
Technical problem to be solved
The invention aims to solve the technical problem of providing a flash steam purification and recovery system, which adopts a skid-mounted device to collect deacidified gas and flash steam flowing out of a flash tank outlet of a dehydration unit, and then achieves the purification effect through a physical adsorbent.
(II) technical scheme
In order to solve the technical problem, the invention provides a flash evaporation gas purification and recovery system, which comprises a purification loop, wherein the purification loop consists of a supercharging device, a heat exchanger, a first separator and a purification device which are sequentially connected; the pressurizing device pressurizes the flash steam collected from the flash tank and forms high-pressure flash steam; the high-pressure flash evaporation gas serving as a heating medium passes through the heat exchanger and is cooled to form low-temperature flash evaporation gas; separating a gas phase part from the low-temperature flash gas in the first separator; the gas phase part of the low-temperature flash evaporation gas passes through the purification device and forms purified flash evaporation gas; the purified flash steam is conveyed to a fuel gas system through a dust filter; and a physical adsorbent is arranged in the purification device.
Further, the purification device comprises two parallel adsorption towers, and physical adsorbents are respectively arranged in the adsorption towers; and two ends of each adsorption tower are respectively communicated with the first separator and the dust filter.
Further, the device also comprises a heating loop and a regeneration loop; the heating loop comprises a heat exchanger communicated with the adsorption tower, so that part of purified flash steam flowing out of the adsorption tower passes through the heat exchanger as a refrigerant, and flows back to the adsorption tower from bottom to top after the temperature is raised to form high-temperature flash steam; the regeneration loop comprises the heat exchanger and a second separator which are sequentially communicated with the adsorption tower, and the high-temperature flash steam passes through the heat exchanger as a heating medium after passing through the adsorption tower and is cooled to form cooled flash steam; and separating a gas phase part of the cooled flash steam in the second separator, and purifying the gas phase part of the cooled flash steam in the adsorption tower.
Furthermore, valves are respectively arranged among the adsorption towers, the heat exchanger, the first separator, the second separator and the dust filter, one of the two adsorption towers is controlled to be communicated with the purification loop through the valves, and the other adsorption tower is controlled to be communicated with the heating loop and the regeneration loop.
Further, a gas holder is further arranged on the purification loop, a gas inlet of the gas holder is respectively communicated with the flash tanks through a normal pressure collecting pipeline, and a gas outlet of the gas holder is communicated with the supercharging device.
Further, the supercharging device is a compressor.
Further, the pressure of the high-pressure flash gas is higher than that of the fuel gas system.
Further, the pressure of the high-pressure flash steam is 0.6-1.5 MPa.
Further, the temperature of the cooled flash steam and the low-temperature flash steam is 40 ℃, the temperature of the high-temperature flash steam is 220 ℃, and the gas amount of the high-temperature flash steam is 10% of that of the low-temperature flash steam.
Furthermore, the purification loop, the heating loop and the regeneration loop are respectively of a skid-mounted structure.
(III) advantageous effects
The technical scheme of the invention has the following beneficial effects:
the invention provides a flash evaporation gas purification and recovery system, wherein a supercharging device pressurizes flash evaporation gas collected from a flash evaporation tank and forms high-pressure flash evaporation gas; high-pressure flash steam as a heating medium passes through the heat exchanger and is cooled to form low-temperature flash steam; separating a gas phase part from the low-temperature flash gas in a first separator; the gas phase part of the low-temperature flash evaporation gas passes through a purification device and forms purified flash evaporation gas; and conveying the purified flash steam to a fuel gas system through a dust filter. The purification and recovery system ensures that the flash steam does not need to pass through a flash tower in each set of equipment, and can directly converge the deacidified gas and the flash steam flowing out of the outlet of the flash tank of the dehydration unit, then carry out pressure boosting and cooling, and then carry out rapid purification. Meanwhile, the skid-mounted device is adopted, so that the skid-mounted device is convenient to move, and the subsequent purification device added in a purification plant is not influenced.
The invention provides a flash evaporation gas purification and recovery system, wherein a physical adsorbent is arranged in a purification device of the flash evaporation gas purification and recovery system, the flash evaporation gas can be rapidly purified, the physical adsorbent can be recycled, and compared with a chemical reaction purification method in the prior art, the flash evaporation gas purification and recovery system is more environment-friendly and has the advantages of simple structure and flexible application.
Drawings
FIG. 1 is a schematic structural diagram of a flash gas purification and recovery system according to the present invention.
Wherein, 1: a normal pressure manifold pipe; 2: a gas holder; 3: a compressor; 4: a heat exchanger; 5: a first separator; 6: an adsorption tower; 7: a dust filter; 8: supplementing a cold source; 9: a second separator.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
As shown in fig. 1, the system for purifying and recovering flash vapor provided in this embodiment adopts a skid-mounted apparatus to recover flash vapor, and mainly includes the following modules: the device comprises a flash evaporation gas collecting and collecting module, a pressurizing module, a cooling module and a one-step purifying module. Specifically, the flash gas purification and recovery system comprises a purification loop consisting of a supercharging device, a heat exchanger 4, a first separator 5 and a purification device which are sequentially connected, wherein the supercharging device, the heat exchanger 4, the first separator 5 and the purification device are respectively communicated through gas pipelines.
Wherein, the supercharging device pressurizes the flash steam collected from the flash tank and forms high-pressure flash steam; the high-pressure flash steam as a heating medium passes through the heat exchanger 4 and is cooled to form low-temperature flash steam; separating the gas phase part from the low-temperature flash gas in a first separator 5; discharging the liquid phase part of the low-temperature flash steam from the bottom of the first separator 5, and allowing the gas phase part of the low-temperature flash steam to pass through a purification device to form purified flash steam; purified flash evaporation gas is conveyed to a liquid separating tank of a fuel gas system of a high-sulfur natural gas purification plant through a dust filter 7 to be communicated, and a purification device, the dust filter 7 and the liquid separating tank are communicated through pipelines respectively; the purification device is internally provided with a physical adsorbent.
In this embodiment, the purification apparatus includes two adsorption towers 6 connected in parallel, physical adsorbents are respectively disposed in the adsorption towers 6, when the adsorption towers 6 are in a purification loop and have a purification function, a gas phase portion of the low-temperature flash vapor enters from the top of the adsorption towers 6 and flows out from the bottom of the adsorption towers 6, and the physical adsorbents can remove acid and water while removing impurities from the purified flash vapor; both ends of each adsorption tower 6 are respectively communicated with the first separator 5 and the dust filter 7. It should be noted that the purification apparatus including two adsorption towers 6 connected in parallel is only one preferable embodiment exemplified in the present embodiment, and the purification apparatus may include any number of adsorption towers 6 connected in parallel as long as the functions in the present embodiment can be satisfied. In addition, because the purification device is internally provided with the physical adsorbent, the flash steam can be rapidly purified, and the physical adsorbent can be recycled, so that the purification device is more environment-friendly compared with a chemical reaction purification method in the prior art.
Also includes a heating circuit and a regeneration circuit; the heating loop comprises a heat exchanger 4 communicated with an adsorption tower 6, namely a three-way pipeline is arranged on a pipeline between the adsorption tower 6 and a dust filter 7, the adsorption tower 6 is respectively communicated with the dust filter 7 and the heat exchanger 4 through the three-way pipeline, so that one part of purified flash steam flowing out of the bottom of the adsorption tower 6 is conveyed to the dust filter 7, the other part of purified flash steam as a refrigerant passes through the heat exchanger 4 and flows back to the bottom of the adsorption tower 6 from bottom to top as regenerated gas of a regeneration loop after the temperature is raised to form high-temperature flash steam; the regeneration loop comprises a heat exchanger 4 and a second separator 9 which are sequentially communicated with an adsorption tower 6, the top of the adsorption tower 6 is communicated with the heat exchanger 4 through a gas pipeline, the heat exchanger 4 is communicated with the second separator 9 through a gas pipeline, a gas phase outlet of the second separator 9 is communicated with the top of the adsorption tower 6 through a gas pipeline after being mixed with gas of a gas phase outlet of the first separator 5, high-temperature flash steam passes through the adsorption tower 6 from the bottom of the adsorption tower 6 upwards to regenerate the physical adsorbent, is discharged from the top of the adsorption tower 6 and passes through the heat exchanger 4 as a heat medium, and is cooled to form cooling flash steam; the cooled flash vapor is separated into a gas phase part in the second separator 9, and the gas phase part of the cooled flash vapor enters the adsorption tower 6 for purification.
Valves are respectively arranged between the adsorption towers 6 and the heat exchanger 4, between the adsorption towers 6 and the first separator 5, between the adsorption towers 9 and between the adsorption towers 6 and the dust filter 7, and one of the two adsorption towers 6 is controlled to be communicated with the purification loop through the valve, and the other adsorption tower is controlled to be communicated with the heating loop and the regeneration loop, so that one adsorption tower 6 is in a purification state, and the other adsorption tower 6 is in a regeneration state.
Generally, the number of the flash tanks in the high sulfur content natural gas purification plant is multiple, and the purification recovery system provided by the embodiment can simultaneously recover the flash gas discharged by each flash tank. Still be equipped with gas holder 2 on the purification loop, the air inlet of gas holder 2 communicates each flash tank respectively through ordinary pressure collecting line 1, and the gas outlet of gas holder 2 communicates supercharging device.
In this embodiment, preferably, the pressure increasing device is a compressor 3, and the pressure of the high-pressure flash gas is greater than the pressure of the fuel gas system, specifically, the pressure of the high-pressure flash gas is 0.6 to 1.5 MPa. The temperature of the cooled flash gas and the low-temperature flash gas was 40 ℃. The temperature of the high-temperature flash steam is 220 ℃.
In operation, the working process of the purification and recovery system provided by the embodiment is as follows: flash steam generated by a plurality of rows of high-sulfur natural gas deacidification and dehydration devices in a high-sulfur natural gas purification plant does not need to pass through a flash tower in each set of device, the flash steam flowing out from the top outlets of flash tanks of the deacidification and dehydration units is directly gathered by a normal pressure gathering pipeline 1, the gathered flash steam enters a gas holder 2, the arrangement of the gas holder 2 can effectively reduce the pressure fluctuation at the inlet of a compressor 3 and reduce the starting frequency of the compressor 3, and therefore, the gas holder 2 has the functions of buffering and collecting the flash steam; the collected flash vapor is pressurized by a compressor 3, the flash vapor flowing out of an outlet of the compressor 3 is cooled to about 40 ℃ by an additional heat exchanger 4, and then is conveyed to a separator through a gas pipeline, and impurities and liquid in the gas are primarily separated; the flash evaporation gas is absorbed and purified by a physical absorbent in the absorption tower 6, enters a dust filter 7 for dust removal, and is then conveyed to a fuel gas system.
In the embodiment, a physical adsorbent is used as a purifying agent of flash gas, and during regeneration, a strand of purified flash gas (the gas amount is 10% of the gas amount of the flash gas to be purified) is taken to exchange heat with moisture through a heat exchanger 4 and is heated to 220 ℃ to be used as the regenerated gas of an adsorption tower 6. The regenerated gas rich in acid and water is cooled to 40 ℃ by the heat exchanger 4, and then is separated by the second separator 9 and then is merged into the unpurified flash steam for recycling. Wherein, can let in heat exchanger 4 with supplementary cold source 8, prevent to utilize the gas in the circulation system can't reach the heat transfer effect of reservation.
In summary, the flash vapor purification and recovery system of the embodiment is applied to collect the acid gas and the flash vapor of the dehydration unit. This purify recovery system adopts sled dress ization device, can adapt to the demand of different natural gas treatment volumes in the at utmost, and has strong adaptability, uses in a flexible way, saves the advantage of time and manpower, can simplify the process of on-the-spot installation and construction. After the physical adsorbent of the flash evaporation gas purification and recovery system is subjected to dry one-step purification, acid gas and water can be removed simultaneously, so that the flash evaporation gas reaches the standard of fuel gas of a purification plant, flash evaporation gas resources are recovered to a fuel gas system, and the flash evaporation gas resources are not required to be treated in a tail gas incinerator as waste gas, so that the problem that the flash evaporation gas cannot be completely combusted to pollute the environment when the tail gas incinerator is in overload operation is solved, effective resources are utilized, and the environment-friendly effects of energy conservation and emission reduction are achieved.
The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (7)
1. A flash evaporation gas purification and recovery system is characterized by comprising a purification loop consisting of a supercharging device, a heat exchanger, a first separator and a purification device which are connected in sequence; the pressurizing device pressurizes the flash steam collected from the flash tank and forms high-pressure flash steam; the high-pressure flash evaporation gas serving as a heating medium passes through the heat exchanger and is cooled to form low-temperature flash evaporation gas; separating a gas phase part from the low-temperature flash gas in the first separator; the gas phase part of the low-temperature flash evaporation gas passes through the purification device from top to bottom to form purified flash evaporation gas; the purified flash steam is conveyed to a fuel gas system through a dust filter; a physical adsorbent is arranged in the purification device;
the purification device comprises two adsorption towers which are connected in parallel, and physical adsorbents are respectively arranged in the adsorption towers; two ends of each adsorption tower are respectively communicated with the first separator and the dust filter;
also includes a heating circuit and a regeneration circuit; the heating loop comprises a heat exchanger communicated with the adsorption tower, so that part of purified flash steam flowing out of the adsorption tower passes through the heat exchanger as a refrigerant, and flows back to the adsorption tower from bottom to top after the temperature is raised to form high-temperature flash steam; the regeneration loop comprises the heat exchanger and a second separator which are sequentially communicated with the adsorption tower, and the high-temperature flash steam passes through the heat exchanger as a heating medium after passing through the adsorption tower and is cooled to form cooled flash steam; separating a gas phase part of the cooled flash steam in the second separator, and purifying the gas phase part of the cooled flash steam in the adsorption tower;
valves are respectively arranged among the adsorption towers, the heat exchanger, the first separator, the second separator and the dust filter, one of the two adsorption towers is controlled to be communicated with the purification loop through the valve, and the other adsorption tower is controlled to be communicated with the heating loop and the regeneration loop.
2. The flash gas purification and recovery system according to claim 1, wherein a gas holder is further arranged on the purification loop, a gas inlet of the gas holder is communicated with each flash tank through a normal pressure collecting pipeline, and a gas outlet of the gas holder is communicated with the pressurization device.
3. The flash gas purification recovery system according to claim 1, wherein the pressurization device is a compressor.
4. The flash gas purge recovery system of claim 3, wherein the pressure of the high pressure flash gas is greater than the pressure of the fuel gas system.
5. The flash gas purification and recovery system according to claim 4, wherein the pressure of the high-pressure flash gas is 0.6-1.5 MPa.
6. The flash gas purification and recovery system according to claim 1, wherein the temperature of the cooled flash gas and the low-temperature flash gas is 40 ℃, the temperature of the high-temperature flash gas is 220 ℃, and the gas amount of the high-temperature flash gas is 10% of that of the low-temperature flash gas.
7. The flash gas purification recovery system according to claim 1, wherein the purification loop, the heating loop and the regeneration loop are each skid-mounted structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611036218.8A CN108079736B (en) | 2016-11-19 | 2016-11-19 | Flash evaporation gas purification and recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611036218.8A CN108079736B (en) | 2016-11-19 | 2016-11-19 | Flash evaporation gas purification and recovery system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108079736A CN108079736A (en) | 2018-05-29 |
| CN108079736B true CN108079736B (en) | 2021-05-04 |
Family
ID=62169846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611036218.8A Active CN108079736B (en) | 2016-11-19 | 2016-11-19 | Flash evaporation gas purification and recovery system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108079736B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111732981B (en) * | 2020-06-10 | 2021-06-08 | 中国石油天然气集团有限公司 | Flash evaporation gas decarburization dehydration method and device based on membrane separation |
| CN113090948B (en) * | 2021-03-30 | 2022-06-03 | 中国石油天然气股份有限公司 | Pressurizing recovery device for flash evaporation gas in sulfur-containing gas field water |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015197233A1 (en) * | 2014-06-26 | 2015-12-30 | Parker Hannifin Manufacturing Germany GmbH & Co. KG | Device and method for drying gases |
-
2016
- 2016-11-19 CN CN201611036218.8A patent/CN108079736B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015197233A1 (en) * | 2014-06-26 | 2015-12-30 | Parker Hannifin Manufacturing Germany GmbH & Co. KG | Device and method for drying gases |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108079736A (en) | 2018-05-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109652155B (en) | Molecular sieve dehydration system and process for natural gas treatment field | |
| CA2897489C (en) | Dehydration equipment, gas compression system, and dehydration method | |
| US8876954B2 (en) | Natural gas dehydration unit with continuously fired reboiler | |
| CN106281476B (en) | A kind of method of sour gas in low temperature washing device for methanol and a kind of removing synthesis gas | |
| RU2653023C1 (en) | Gas preparation installation | |
| CN109957429A (en) | The system and method for the natural gas molecule sieve adsorption dewatering of structure is utilized with recuperation of heat | |
| RU2367505C1 (en) | Gas preparation unit | |
| CN108079736B (en) | Flash evaporation gas purification and recovery system | |
| CN101664631B (en) | Energy-saving separation device for mixed gas molecular sieve | |
| CN102765733B (en) | Device and technique of producing liquid ammonia by coke oven gas and methanol relief gas | |
| RU2637242C1 (en) | Method for regeneration of drying process adsorbent and purification of hydrocarbon gas (versions) and system for its implementation | |
| CN112745974B (en) | Membrane separation method oilfield associated gas purification process and system based on adsorption dehydration pretreatment | |
| CN103157346A (en) | Low-temperature methanol washing and CO2 trapping coupling method and system | |
| CN104163404A (en) | Recycling method and device for regenerated waste nitrogen in nitrogen purification process | |
| CN109370670B (en) | Process system for simultaneously removing carbon dioxide, water and heavy hydrocarbon in natural gas | |
| CN211595550U (en) | Natural gas decarbonization system | |
| CN211595551U (en) | Natural gas decarbonization system | |
| CN209836108U (en) | Natural gas purification system | |
| CN104073310A (en) | Device and method for purifying and drying natural gas | |
| CN204311038U (en) | A kind of energy-saving natual gas dehydrate unit | |
| CN102994171A (en) | Gas turbine generating coke oven gas comprehensive purification system and purification method thereof | |
| CN202343067U (en) | PSA (Pressure Swing Adsorption) molecule sieve system of oxygen making machine | |
| RU2625159C1 (en) | Sulfur hydrocarbon gas steam conversion plant | |
| JP3544860B2 (en) | Pretreatment device in air separation unit | |
| CN217459352U (en) | Natural gas dewaxing and dewatering device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |